html, body {
    width: 100%;
}
ul li {
    list-style: none;
}
*{margin:0;padding:0;}
#box {
    width: 1200px;
    margin: 20px auto;
}
.slide {
    height: 400px;
    position: relative;
}
.slide ul {
    height: 100%;
}
.slide li {
    position: absolute;
    left:200px;
    top:0;
}
.slide li img{
    width: 100%;
    height:310px;
}
.arraw {
    opacity: 0;
}
.arraw a {
    width: 60px;
    height: 100px;
    display: block;
    position: absolute;
    top: 50%;
    margin-top: -55px;
    z-index: 999;
}
.next {
    background: url("../images/right.png") no-repeat;
    right: -10px;
    opacity: .5;
    filter: alpha(opacity=50);
}
.prev {
    background: url(../images/left.png) no-repeat;
    left: -10px;
}